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For those that don't know, a clean install can be done with an upgrade Windows 7, have a look at the tutorial at the link below.
Clean Install with a Upgrade Windows 7 Version
i installed build 7600 but it won't work again
Silly question maybe.... but have you got Hybrid Sleep on? type Power options into the start menu, click change plan settings and then change advanced settings, go to sleep and check that "Allow Hybrid Sleep" is off :)
you will need to do this for all your power plans if it switches between them on batteries and mains power
Windows 7 won't allow a hibernate if Hybrid Sleep is on, because it is basically a sleep AND a hibernate. to be honest the option to hibernate shouldn't even be available, but they seemed to forget to remove it from the "change what the buttons do" bit (which is what im guessing you changed the lid options in)